-er -th bbb bbe bbh bbi bbr bbt be- beb bee beh bei ber bet bez bhb bhe bhh bhi bhr bht bi- bib bie bih bii bir bit biz brb bre brh bri brr brt brz btb bte bth bti btr btt btz bze bzh bzr bzz ebb ebe ebh ebi ebr ebt eeb eee eer eet ehb ehe ehh ehi ehr eht eib eie eii eir eit erb ere erh eri err ert erz etb ete eth eti etr ett etz eze ezh ezr ezz h-i hbb hbe hbh hbi hbr hbt hbz he- heb hee heh hei her het hez hhb hhe hhh hhi hhr hht hhz hib hie hih hii hir hit hr- hrb hre hrh hri hrr hrt hrz htb hte hth hti htr htt htz hze hzt ibb ibe ibh ibi ibr ibt ibz ie- iee iei ier iet ihb ihe ihh ihi ihr iht iib iie iih iii iir iit ir- irb ire iri irr irt itb ite ith iti itt itz ize izh izi izz rbb rbe rbh rbi rbr rbt re- reb ree reh rei rer ret rez rh- rhb rhe rhh rhi rhr rht rib rie rih rii rir rit riz rrb rrh rri rrr rrt rtb rte rti rtr rtt rtz rzb rze tbb tbe tbh tbi tbr tbt tbz te- teb tee teh tei ter tet tez th- thb the thh thi thr tht thz tib tie tih tii tir tit tiz trb tre trh tri trr trt trz ttb tte tth tti ttr ttt tze zbb zbr zbt zeb zee zeh zer zet zez zhe zhi zhr zib zie zir zit ziz zrh zte ztr zzr zzt zzz

bbbb bbeb bbet bebb bebe bebi beeb beer beet behr beir beit bere beri berr bert bete beth beti bett betz beze bezi bher bhet bhie bhir bhit bhrt bibb bibe bibi bieb bier biet bihe bihi birb bire biri birr birt bite bith bitt bitz bize bizz breb bree brei brer bret brez brie brih brit briz brrr btie btrt bttb bzer bzie bzzt bzzz ebbr eber ebit eeee eete eeth eeze eheh eher ehre ehte eiei eier eire eitb eith eiti eitr erbb erbe ereb erei erer eret erez erie erih erit eriz erre erth ertz erzi etbr etee eter eth- ethe etre ette etti ezer ezri h-ii hbit hebb hebe hebi hebr heeb heer heet hehe heie heih heir heit herb here heri herr hert herz hete heth hett hetz heze hezi hhhh hibi hibt hiei hier hiet hihe hihi hiht hiie hiit hire hiri hirt hite hiti hitt hitz hizz hree hrib hrit hrtb hrte htet httr i-be ibeh ibet ibie ibri ibtb ieet ieie iere ieri iett iher ihit ihre iiht iiie iiii iiit iitr iitt irbe iree irer iri- irie irre irri irte irti itbe iter itet ithe itie itri izeh izet izze rbbb rbbr rebb rebe reeb reet rehb rehe rehi reht reii reir reit reiz rere reri rert rete reth reti retr rett retz reze rezh rezi rheb rhee rhet rhib rhiz rib- ribe rier riet riez riht rire riri rite rith riti ritt ritz rize rizi rizz rrrr rtee rtei tbit tbrb teer teet teez tehi tehr teie teir ter- tere teri terr tete teth teti tetr tett tetz tezz the- theb thee thei ther thet thi- thie thir thre thri thtb thtr tibi tie- tiee tiei tier tiet tiht tiit tirb tire tiri tirr tite tith titi titt titz tizi tizz tre- tree trei tret trez tri- trib trie trit triz trte trtr ttbb tter tttt tzzt zber zebe zehi zeir zeit zeri zert zete zeze zhee ziri ziti zizi zizz zrze zzhz zzzz

-tree bbbee be-er beber bebti beebe beeri beete beeth beez beher behet behie behir beibi beier beihe beire beite beith beitz beizi berbe bereh berei beret berhe berie berit beriz berre berri berte berth berti berze betee beter bethe betie betre bett- bette betti bezer bezhi bheer bheri bibbe biber bibie bibri biebe biere bieri biert bieti biher birie birth biter bitez bitit bitte bitti bitzi bizeh bizet bizzi breer breet breit breiz brere breth brett bretz breze brezi bribe brier brite brith britt britz brize brizz brrrr btr-t bzeit bzzzt ebber ebbet ebbie ebert ebibe eeeee eerie eetti ehire ehret eirie eiter eithe eitri eizie erbbe erber erere eretz erier erite erith erte erter erthe etete ether etite etree etter ettie h-e-b h-iib he-he hebbe hebe- hebei heber hebri heeii heere heete heeze hehte heihe heire heith heiti heitz heize herei herez herie herit heriz herre herte herth herti hertz heter hethe hette hheth hhhhh hi-hi hibhi hibit hibri hier- hiree hirer hirth hirtz hithe hitit hitte hrere hthrt htree i-bet ibert ibeti iebet ieiri ierei iethe iette iezer iherb ihere ihite iiiee iiiii iitti irbit irete irite irrit itbit itete itezi ithee ither itire itter itthe ittre ittti itzer izier izzet rebbe reber rebet rebit reere reerh reeth reeti reetz reeze reher rehet rehit rehri rehti reith reitz rere- reree reret rerez rerir retee reter rethe retie rette rhett rhiz- ribbi riber ribet ribie rieth rieti rietz rihte ririe rithe rithi rittz ritzi rizeh rizzi tbeti tbtbt teber tebet tebi- teeth tehee tehri teize teret terre terri tert- terzi teter tethe tetr- tetri tette tezie tezir thebe theeb theei theer theie their theit ther- there theri thete theth theze thibi thier thire thiri thite thizz thre- three thret thrie ti-he ti-hi ti-ti tibbi tiber tibet tieit tiere tieri tierz tieth tietz tiree tireh tirer tiret tirit tiriz tirth titer tithe tithi titii titre titte titti tizer tizri treer treet treib treie treit trere treri trete trett tribe trieb triei trier triet trit- trite tritt ttttt tzere z-ter zebi- zebre zeher zehir zehri zeitz zerbe zerit zerre zerti zetti zibet zibib ziezi zitte zizit zizzi zrbtt zzzzz

b-tree bbbbbb bebite beebee beerze beeter beezer behete behite behter behzti beiber beiriz berbee berber bereet berere berhet berith berrer berret berrie berriz berthe bertie bertre betere